Relative major and minor scales share the same key signature. Bb major and g minor both have 1 flat, Bb. Same goes with C major and A minor, no flats and no sharps. To make a major into a minor, you take the 6th note of the major scale and make it the tonic of the minor scale.
Bb major: F G A Bb C D E F g minor: D E F G A Bb C D
Eb major: Bb C D Eb F G A Bb c minor: G A Bb C D Eb F G
F major: C D E F G A B C d minor: A B C D E F G A
Ab major: Eb F G Ab Bb C D Eb f minor: C D Eb F G Ab Bb C
C major: G A B C D E F# G a minor: E F# G A B C D E
G Major: D E F# G A B C# D e minor: B C# D E F# G A B
Db Major: Ab Bb C Db Eb F G Ab bb minor: F G Ab Bb C Db Eb F
Gb Major: Db Eb F Gb Ab Bb C Db eb minor: Bb C Db Eb F Gb Ab Bb
D Major: A B C# D E F# G# A b minor: F# G# A B C# D E F#
A Major: E F# G# A B C# D# E f# minor: C# D# E F# G# A B C#
E Major: B C# D# E F# G# A# B c # minor: G# A# B C# D# E F# G#
Cb Major: Gb Ab Bb Cb Db Eb F Gb ab minor: Eb F Gb Ab Bb Cb Db Eb
Bb major: F G A Bb C D E F g minor: D E F G A Bb C D
Eb major: Bb C D Eb F G A Bb c minor: G A Bb C D Eb F G
F major: C D E F G A B C d minor: A B C D E F G A
Ab major: Eb F G Ab Bb C D Eb f minor: C D Eb F G Ab Bb C
C major: G A B C D E F# G a minor: E F# G A B C D E
G Major: D E F# G A B C# D e minor: B C# D E F# G A B
Db Major: Ab Bb C Db Eb F G Ab bb minor: F G Ab Bb C Db Eb F
Gb Major: Db Eb F Gb Ab Bb C Db eb minor: Bb C Db Eb F Gb Ab Bb
D Major: A B C# D E F# G# A b minor: F# G# A B C# D E F#
A Major: E F# G# A B C# D# E f# minor: C# D# E F# G# A B C#
E Major: B C# D# E F# G# A# B c # minor: G# A# B C# D# E F# G#
Cb Major: Gb Ab Bb Cb Db Eb F Gb ab minor: Eb F Gb Ab Bb Cb Db Eb